|
| year | production | consumption |
| 1980 | | |
| 1981 | | |
| 1982 | | |
| 1983 | | |
| 1984 | | |
| 1985 | | |
| 1986 | | |
| 1987 | | |
| 1988 | | |
| 1989 | | |
| 1990 | | |
| 1991 | | |
| 1992 | | 77.69 |
| 1993 | | 63.57 |
| 1994 | | 49.44 |
| 1995 | | 49.44 |
| 1996 | | 70.63 |
| 1997 | | 84.76 |
| 1998 | | 81.58 |
| 1999 | | 74.16 |
| 2000 | | 75.22 |
| 2001 | | 72.40 |
| 2002 | | 77.69 |
| 2003 | | 84.05 |
| 2004 | | 76.63 |
| 2005 | | 86.52 |
| 2006 | | 93.58 |
| 2007 | | 86.17 |
| 2008 | | 88.99 |
| 2009 | | 82.28 |
| 2010 | | 76.63 |
| 2011 | | 74.51 |
|
|